FAN5235 Fairchild Semiconductor, FAN5235 Datasheet
FAN5235
Manufacturer Part Number
FAN5235
Description
System Electronics Regulator for Mobile PCs
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN5235.pdf
(15 pages)
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FAIRCHILD
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20 000
Features
• Synchronous rectification
• ±1% precision internal reference
• >90% efficiency
• Input and output voltage feedback
• 5.4V to 24V input voltage range
• Internally set 300kHz ±15% oscillator
• 5V and 3.3V Main outputs switch out of phase
• 5V-ALWAYS and 3.3V-ALWAYS outputs
• Adjustable boost converter for 12V
• Boost converter slaved to 5V Main
• Input UVLO
• Outputs OVP of Buck Converters
• Precision current limit option for 5V, 3.3V Main
• Power Good Voltage Monitor
Applications
• Notebook PCs and PDAs
• Hand-held portable instruments
Typical Application
FAN5235
System Electronics Regulator for Mobile PCs
3.3V @ 5A
3.3V-ALWAYS@50mA
+
5V-ALWAYS
5V-ALWAYS@ 50mA
PGOOD
SDN3.3
1 VIN
2 3.3 ALW
3 CPUMP3.3
4 HSD3.3
5 SW3.3
6 5V-ALW
7 LSD3.3
8 GND3.3
9 ISEN3.3
10 VFB3.3
11 SDN3.3
12 PGOOD
Vin = 5.4-24V
FAN5235
CPUMP5 24
VFB12 15
SDWN 13
Description
The FAN5235 is a high efficiency and high precision
DC/DC controller for notebook converters. Utilization of
both input and output voltage feedback in a current-mode
control allows for fast and stable loop response over a wide
range of input and output voltage variations. The two main
regulators switch out of phase to minimize input ripple
current.
Current sense based on MOSFET Rdson gives maximum
efficiency, while also permitting use of a sense resistor for
high accuracy. An externally adjustable boost converter can
be set to generate 12V.
The FAN5235 is available in a 24-pin QSOP package, and in
a 24-pin TSSOP package.
ISEN5 21
SGND 14
GND5 19
HSD5 23
SDN5 17
SW12 16
LSD5 20
VFB5 18
SW5 22
SDWN
SDN5
VFB12
www.fairchildsemi.com
5V-ALWAYS
5V @ 5A
REV. 1.3.3 1/3/02
+
12V @ 120mA
+
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